/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jbpm.bpmn2.xml;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

import org.drools.core.xml.BaseAbstractHandler;
import org.drools.core.xml.ExtensibleXmlParser;
import org.drools.core.xml.Handler;
import org.jbpm.workflow.core.impl.WorkflowProcessImpl;
import org.kie.api.definition.process.Process;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class ImportHandler extends BaseAbstractHandler implements Handler {

	public ImportHandler() {
		if ((this.validParents == null) && (this.validPeers == null)) {
			this.validParents = new HashSet();
			this.validParents.add(Process.class);

			this.validPeers = new HashSet();
			this.validPeers.add(null);

			this.allowNesting = false;
		}
	}

	public Object start(final String uri, final String localName,
			final Attributes attrs, final ExtensibleXmlParser parser)
			throws SAXException {
		parser.startElementBuilder(localName, attrs);
		WorkflowProcessImpl process = (WorkflowProcessImpl) parser.getParent();

		final String name = attrs.getValue("name");
		final String type = attrs.getValue("importType");
		final String location = attrs.getValue("location");
		final String namespace = attrs.getValue("namespace");
		emptyAttributeCheck(localName, "name", name, parser);

		if (type != null && location != null && namespace != null) {
    		Map<String, String> typedImports = (Map<String, String>) process.getMetaData(type);
    		if (typedImports == null) {
    		    typedImports = new HashMap<String, String>();
    		    process.setMetaData(type, typedImports);
    		}
    		typedImports.put(namespace, location);
		} else {
		
    		java.util.Set<String> list = process.getImports();
    		if (list == null) {
    			list = new HashSet<String>();
    			process.setImports(list);
    		}
    		list.add(name);
		}
		return null;
	}

	public Object end(final String uri, final String localName,
			final ExtensibleXmlParser parser) throws SAXException {
		parser.endElementBuilder();
		return null;
	}

	public Class generateNodeFor() {
		return null;
	}

}
